I have 3.5 - 4.5 cords C/S/S (I stacked it log cabin, so up to 30% loss by volume I am told) thus far, binging on a weekend here or there since November when I can get wood. Previously my back had been a tiny bit sore, but nothing big. I think my back has adjusted well to swinging the Fiskars X27, I can swing all day now. The muscles in my hands would actually be sore from gripping the ax all day. Now they tolerate it well. Well this past 3-day weekend I didn't have wood from my usual supply, so I turned to another source on Craigslist in order to make effective use of the long weekend in my race to get two years ahead on my wood supply. I took delivery of my first (and likely last) "10 yarder" (12 ft. long by 8 ft. wide by 4 ft. high). The landscaper was honest in stating it was logs ranging from 20-40in in diameter, but it put me into overdrive for a little too long. When I went to bed I kept waking up from tingling fingers last night. This morning the tingling is gone, but my hands are sore. I contribute this almost solely to this white collar guy using his chainsaw for all weekend long and the vibrations. I have much respect for folks who cut wood for a living. Going forward I don't think I'll bite off that much wood at once again and I won't go for hours straight for a long weekend. I desperately want to get my C/S/S done asap (8 cords max for 1974 sq foot ranch in CT) for proper drying next year when I buy my insert but not at the cost of my health (my googling says this is related to Carpal Tunnel). Here is the 10 yarder: And here is my wood pile this morning:What you can't see is the area between the chunks of wood and the stacked area... it's like a battle zone between the large diameter chunks of wood and my Fiskars X27.... splitting splits off the side of the large chunks and whittling them down. There are also large piles of unstacked splits to the right and left of my woodpile.... stacking is going to take "a bit" of time. Haha. So lesson learned... a pickup truck's worth at a time is just right for me, the 10 yarder was a lot of wood and a lot of mess for my side yard with all the sawdust, and I'm not so young anymore.